Concrete building-block.



J. J GOYNE.

CONCRETE BUILDING BLOCK.

APPLICATION FILED APR. 3. 1900.

944,950. v Patented Dec.28, 1909.

I T r G v "7' E i i :7?- j d?- JAMES J. COYIIE, 0F FQND DU LAC,WISCONSIN.

CONCRETE BUILDING-BLOCK.

Specification of Letters Patent.

Patented Dec. 28, 1909.

Application filed April 8, 1909. Serial No. 487,752.

To all whom it may concern:

. Be it known that I, JAMES J. CoYNE, citizen of the United States,residing at Fond du Lac, in the county of Fond du Lac and State ofWisconsin, have invented certain new and useful Improvements in ConcreteBuilding-Blocks, of which the following is a specification.

My invention relates to improvements in building blocks, such as areconstructed of concrete material and provided with an interior airspace. I

In the drawing I have shown my invention in a curved form adapted to theconstruction of silos. The blocks are laid against each other in coursesand the joints filled with mortar.

' My invention consists of two blocks of similar construction tiedacross an air space with tie-hooks embedded in the concrete material,the tie-hooks being zig-zagged to afford stability. The blocks are madein molds, the tie-hooks being held in a zig-zag position relative toeach other by the walls of the mold until the concrete material isfilled in around the hook-ends.

My invention further comprises a mortar-groove extending lengthwisecentrally of each block.

My invention further comprises a rabbeted end upon each block adapted tointerlock with the oppositely rabbeted end of the adjoining block. i

My invention further comprises the construction of the inner parts ofthe rabbeted ends shorter than the outer parts so that in laying thewall the inner joints of each block will be close joints and the outerjoints'will be open joints to receive the men.

ta'r, thus providing a tell-tale joint upon both the outer and innersurfaces of the'completed wall, and a tight joint between the parts onthe surfaces forming the walls of the air-space.

In the accompanying drawing Fi re 1 represents a top view and Fig. 2 anen view of a portion of curved wall embodying my invention. Fig. 3 is aview in perspective of one of the blocks and Fig. 4 is a view of one ofthe tie-hooks.

Similar letters refer to similar parts in each view.

A, A represent the blocks, B, B, the rabbeted ends, C the air space, D,D, D etc. the

tie-hooks and E the mortar groove centrally of the top of each block, F,F represent the inner closed joints and G, G represent the outer openjoints. The open jOlIltS are denominated tell-tale joints as theinspector can easily see whet-her they are properly filled with mortar,H, H represent the mor-. tar-joints between the coursings. The advantageof the mortar-grooves E, E to insure a closedjoint will be understood.It will be observed that the tie-hooks D, D, D'etc. are arranged in azig-zag manner across the air space.

By means of my invention, when the wall is completed a continuous airspace is pro-. vided. There are practically two walls with an air spacebetween. j

- Having thus described my invention what I claim is:

In a silo wall comprising in its construc- This aflords added stabilityto the completed block.-

tion arcuate blocks spaced apart,'a continuous air space betweenthev'valls, the'walls being tied together by hook members extending atan angle to each other across the air space and having their hooked endsembedded in the walls, the arcuate blocks hav- 1 ing grooves formed intheir horizontal faces for receiving mortar, the blocks being tightlyjoined together at their ends on their concave faces and spaced apart ontheir convex faces for the urpose of receiving mortar, substantially sliown and described;

In testimony whereof I 'afiix my signature,

in presence of two witnesses. JAMES J. COYNE.

Witnesses; I

A. R. WA'rEnnoUsn, M. H. OBRIEN.

